This set was released as bonus for CosHolic 4. It was not for sale so it's smaller then the usual sets. And this is the last CosHolic 4 set of Chouzuki Maryou-san that had not been uploaded on e-hentai.
Heh, It's gotten to the point where I am so excited to see anything new involving Chouzuki, that I just instantly rate it 5 stars and favorite it without even looking at the images. Though, I must ask, is it just me, or has she looked a little thinner over the last few sets? Say it ain't so! Tell me I'm imagining things!